28 



THE TRANSATLANTIC LONGITUDE. 



OBSERVATIONS AT NEWFOUNDLAND. 



Here the Kessels clock was used, and the C. S. transit-instrument No. 6. For 

 determining the intervals of the threads, 100 complete transits of 43 stars are 

 available, which were assorted into seven classes, and the several results of these 

 combined according to weights. 



Happily the reticule of this instrument had remained unchanged and unharmed 

 during ten previous longitude-expeditions, for each one of which the equatorial 

 intervals had been carefully determined. The subjoined values are already reduced 

 to the focus used at Heart's Content ; those in the first column being derived from 

 eight, and those in the second from two, independent expeditions. In forming the 

 series of adopted values, they received the weights 4 and 1 respectively ; the Heart's 

 Content results having the weight 1 also. 



Equatorial Thread-intervals of Transit No. 6. . 





From 8 campaigns 



Macon and 



Heart's Content, 



Adopted. 





before 1859. 



Appalacliicola, 

 1859, 1860. 



1866. 





B, 



-f35^650 



-1-35'. 681 



+ 35^.604 



-f35'.648 



B. 



33.120 



33.111 



33.111 



33.118 



B3 



30.623 



30.614 



•30.616 



30.620 



B, 



28.054 



28.062 



28.052 



28.054 



b: 



- 25.431 



25.426 



25.425 



25.433 



c, 



20.565 



20.552 



20.610 



20,510 



c, 



11.950 



11.931 



11.954 



11.952 



C3 



15.401 



15.405 



15.403 



15.406 



c 



12.103 



12.695 



12.686 



12.699 



c. 



10.249 



10.240 



10.228 



10 244 



r>. 



5.100 



5.106 



5 116 



5 104 



D. 



2.585 



2.590 



2 600 



2.588 



Da 



-1-0.052 



+ 0.068 



-f- 0.084 



+ 0.060 



I>4 



—2.461 



— 2.469 



— 2 414 



— 2.464 



•B, 



5.066 



5.085 



5.018 



5.011 



E. 



10.112 



10.091 



10.092 



10.106 



E3 



12.828 



12.831 



12.813 



12.821 



E3 



15.341 



15.344 



15.343 



15.342 



E4 



. 11.969 



11.968 



11.964 



11.968 



E. 



20.441 



20.460 



20.441 



20.448 



E, 



25.543 



25.582 



25.535 



25.540 



E 



28.120 



28.116 



28.103 



28.116 



P3 



30.692 



30.691 



30.684 



30.691 



E4 



33.141 



33.152 



33.134 



33.146 



F. 



—35.110 



—35.146 



—35.834 



—35.111 



The correction for inequality of pivots, resulting from the NeAvfoundland obser- 

 vations is — 0".019, and since the average value deduced from the last five previous 



